A direct connection fan motor set special for a water cooling tower

Abstract

The utility model relates to the technical field of cooling tower, concretely is a kind of direct-connection fan motor unit specially used for cooling tower. Including being located in the axial fan and direct-drive reluctance synchronous motor of wind cylinder, axial fan is connected in the output end of direct-drive reluctance synchronous motor, and the body of direct-drive reluctance synchronous motor is vertically arranged on cooling tower through base;Base includes support ring surface, annular boss embedded with the bottom of direct-drive reluctance synchronous motor is equipped on the inner ring of support ring surface, a plurality of evenly distributed fixing lug are equipped on the outer ring of support ring surface, and a plurality of evenly distributed support feet are equipped on the bottom of support ring surface. The fan motor unit of the utility model can be directly connected by direct-drive reluctance synchronous motor and axial fan through conical structure, reduces long shaft, speed reducer and other structures, and the rotating speed of axial fan can be adjusted according to actual working condition;Direct-drive reluctance synchronous motor is stably connected on the top of cooling tower through base.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, specifically a direct-drive fan motor unit for cooling towers. Background Technology

[0002] The cooling tower is equipped with a fan to further cool the high-temperature water inside the tower, such as... Figure 1 The original cooling tower has a fan 40 installed at the top, driven by an asynchronous motor 10. The motor 10 is fixed to the tower, and its output is connected to a long shaft 20, which in turn connects to a reducer 30. The reducer 30 has a coupling for connecting the fan 40, ultimately enabling the asynchronous motor 10 to drive the fan 40. This is how the existing fan unit has been used until new technologies are introduced. However, with the advancement of technological reforms, the reducer 30 and coupling in the cooling tower not only have high energy consumption but also require frequent maintenance. The economic and time costs of maintaining and repairing the reducer 30 and coupling are both high. Furthermore, the reducer 30 and coupling generate significant noise during the cooling tower's operation, which contradicts the requirements of energy conservation, low carbon emissions, and environmental protection.

[0003] Therefore, improvements to the cooling tower's fan units are necessary from both an energy conservation and environmental protection perspective and in terms of technological innovation requirements. Utility Model Content

[0004] The problem to be solved is to provide a more energy-efficient and environmentally friendly direct-drive fan unit solution for cooling towers, replacing the asynchronous motor drive method in existing technologies.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a direct-drive fan motor unit for cooling towers, comprising an axial flow fan and a direct-drive reluctance synchronous motor housed within a fan casing. The axial flow fan is connected to the output end of the direct-drive reluctance synchronous motor, and the motor body is vertically mounted on the cooling tower via a base. The base includes a support ring surface, with an annular boss on the inner ring surface that engages with the bottom of the direct-drive reluctance synchronous motor, and multiple evenly distributed fixing ears on the outer ring surface. The bottom of the support ring surface has several evenly distributed support feet.

[0006] Preferably, the base is made of steel, and the annular boss, fixing lugs and support feet are all integrally formed on the support ring surface.

[0007] Preferably, the axial flow fan and the direct-drive reluctance synchronous motor are connected by a conical structure.

[0008] Preferably, the axial conical structure includes a conical hole and a conical shaft. The conical hole is located on one side of the axial flow fan, and the conical shaft is located on the side of the direct drive reluctance synchronous motor. The conical shaft can be inserted into the conical hole and drive the axial flow fan to rotate.

[0009] Preferably, the axial flow fan includes a hub with a tapered hole at the center of the lower part of the hub, the output end of the direct-drive reluctance synchronous motor is a tapered shaft, and fan blades are connected around the hub, with no fewer than four fan blades and evenly distributed.

[0010] Preferably, a three-parameter monitoring instrument is connected to the direct-drive reluctance synchronous motor.

[0011] Compared with existing technologies, this utility model provides a direct-drive fan motor unit specifically for cooling towers, which has the following advantages: Compared with existing fan units, the existing fan units consume more electricity, and the couplings and gearboxes are troublesome to maintain and prone to failure, resulting in high maintenance costs. Furthermore, the fan speed cannot be flexibly adjusted according to the changing seasons of the cooling tower. The fan motor unit of this utility model can achieve direct connection between a direct-drive reluctance synchronous motor and an axial flow fan through a conical structure, reducing the need for long shafts, reducers, and other structures. The speed of the axial flow fan can be adjusted according to actual working conditions. The direct-drive reluctance synchronous motor is stably connected to the top of the cooling tower via a base. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a wind turbine generator set in the existing technology;

[0013] Figure 2 This is a schematic diagram of the structure of the fan motor unit of this utility model;

[0014] Figure 3 This is a top view of the base of this utility model;

[0015] Figure 4 for Figure 3 Schematic diagram of the cross section at point AA;

[0016] Figure 5 for Figure 2 Schematic diagram of the cross-section at point B in the middle;

[0017] Figure 6 This is a top view of the axial flow fan of this utility model;

[0018] Explanation of reference numerals in the attached diagram: 1. Fan unit; 2. Three-parameter monitor; 3. Axial flow fan; 31. Hub; 32. Fan blade; 33. Conical hole; 4. Direct drive reluctance synchronous motor; 41. Conical shaft; 5. Base; 51. Support ring surface; 52. Annular boss; 53. Fixing lug; 54. Support foot; 6. Frequency converter; 7. Signal thermometer one; 8. Signal thermometer two; 10. Asynchronous motor; 20. Connecting long shaft; 30. Reducer; 40. Fan. Detailed Implementation

[0019] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0020] This invention considers using a direct drive method to replace the indirect drive method in the existing technology, such as... Figure 2 As shown, this utility model of a special wind turbine for cooling towers eliminates the long shaft and gearbox, and mounts the fan blades 32 onto the direct-drive reluctance synchronous motor 4 via the hub 31. The direct-drive reluctance synchronous motor 4 is directly controlled by a frequency converter and can be adjusted from 0-100% speed, which is superior to existing designs. Figure 1 This wind turbine unit saves approximately 30% on electricity, significantly reduces maintenance costs and downtime, and greatly reduces the labor intensity for workers. The direct-drive wind turbine motor unit of this invention produces very little noise, making it extremely quiet. Therefore, compared to existing wind turbine units, it better meets the requirements of energy conservation and environmental protection.

[0021] Specifically, such as Figure 2 The diagram illustrates a direct-drive fan and motor unit for cooling towers, comprising an axial flow fan 3 and a direct-drive reluctance synchronous motor 4 housed within a fan casing. The axial flow fan 3 is connected to the output end of the direct-drive reluctance synchronous motor 4. Specifically, the axial flow fan 3 and the direct-drive reluctance synchronous motor 4 are connected via a conical structure. The conical structure includes a conical hole 33 and a conical shaft 41. The conical hole 33 is located on one side of the axial flow fan 3, and the conical shaft 41 is located on one side of the direct-drive reluctance synchronous motor 4. The conical shaft 41 can be inserted into the conical hole 33 and drive the axial flow fan 3 to rotate.

[0022] The direct-drive reluctance synchronous motor 4 is vertically mounted on the cooling tower via a base 5. The base 5 includes a support ring surface 51. The inner ring of the support ring surface 51 has an annular boss 52 that engages with the bottom of the direct-drive reluctance synchronous motor 4. The outer ring of the support ring surface 51 has multiple evenly distributed fixing ears 53. The bottom of the support ring surface 51 has several evenly distributed support feet 54. The base 5 is made of steel, and the annular boss 52, fixing ears 53, and support feet 54 are all integrally formed on the support ring surface 51. The base 5 is made of stainless steel. Figure 3 , Figure 4 In the embodiment shown, the outer diameter d3 of the support ring surface 51 is 836cm, the outer diameter d2 of the annular boss 52 is 680cm, the inner diameter d1 of the annular boss 52 is 630cm, and the thickness a of the support ring surface 51 where the annular boss 52 is located is 41cm. The size and thickness can be adjusted according to different working conditions.

[0023] The axial flow fan 3 includes a hub 31 connected to a conical shaft 41 and fan blades 32 connected to the hub 31. There are at least four fan blades 32, evenly distributed, and the fan blades 32 are made of fiberglass. The hub 31 has a conical hole 33, which houses the conical shaft 41. The conical hole 33 and the conical shaft 41 are interference-fitted, allowing the hub 31 to rotate synchronously with the conical shaft 41. The conical shaft 41 serves as the output of a direct-drive reluctance synchronous motor 4, rotating after the direct-drive reluctance synchronous motor 4 is turned on. Figure 4In the illustrated embodiment, the taper of the conical structure is 1:20, the large end of the cone is 90cm, the diameter D of the hub 31 is 860cm, and the vertical height H of the hub 31 is 220cm. Specific dimensions can be adjusted according to the scale of the cooling tower. The hub 31 is made of stainless steel. In this utility model's fan motor unit, the hub 31 and the conical shaft 41 are connected by a conical connecting shaft. The conical hole 33 is narrower at the top and wider at the bottom, and the conical shaft 41 is also narrower at the top and wider at the bottom. This facilitates the hub 31 being fitted onto the conical shaft 41 of the direct-drive reluctance synchronous motor 4 from top to bottom. Furthermore, the axial flow fan 3 rotates clockwise, so the conical shaft 41 and the axial flow fan 3 become increasingly tighter with each rotation, making operation safer and preventing the axial flow fan 3 from being thrown off the direct-drive reluctance synchronous motor 4.

[0024] A three-parameter monitor 2 is connected to the direct-drive reluctance synchronous motor 4. The three-parameter monitor 2 detects the vibration value, oil temperature, bearing temperature, and winding temperature of the direct-drive reluctance synchronous motor 4. If these values ​​exceed the standards, the direct-drive reluctance synchronous motor 4 may be damaged, leading to a production safety accident. The three-parameter monitor 2 effectively detects these parameters to prevent them from exceeding standard values. In practical use, the model of the three-parameter monitor 2 can be HG-zD; the model of the direct-drive reluctance synchronous motor 4 can be TSM720-40, with a power of 185kW, a rated speed of 127r / min, a frequency range of 0-45Hz, a speed range of 0-145r / min, a rated current of 336A, a protection rating of IP67, an insulation class of H, and a rated torque of 13910N.M.

[0025] To facilitate the adjustment of the speed of the direct-drive reluctance synchronous motor 4, a signal thermometer 7 is installed on the inlet pipe of the cooling tower, and a signal thermometer 8 is installed on the outlet pipe. The speed of the direct-drive reluctance synchronous motor 4 is adjusted based on the temperature data from signal thermometers 7 and 8. Signal thermometers 7 and 8 are model WZPB-230 / PT100. The speed of the direct-drive reluctance synchronous motor 4 is dynamically adjusted based on the inlet water temperature T1 and the outlet water temperature T2. Signal thermometer 7 collects the inlet water temperature T1, and signal thermometer 8 collects the outlet water temperature T2.

[0026] 1) When the inlet water temperature T1 is less than the set value, the signal thermometer 7 transmits the T1 temperature signal to the frequency converter 6, and the frequency converter 6 adjusts and reduces the speed of the direct drive reluctance synchronous motor 4.

[0027] 2) When the outlet water temperature T2 is less than the set value 2, the signal thermometer 28 transmits the T2 temperature signal to the frequency converter 6, and the frequency converter 6 adjusts and reduces the speed of the direct drive reluctance synchronous motor 4.

[0028] 3) When the inlet water temperature T1 and the outlet water temperature T2 are both greater than their set values, the signal thermometer 7 and the signal thermometer 8 transmit the temperature signal to the frequency converter 6, and the frequency converter 6 increases the speed of the direct drive reluctance synchronous motor 4.

[0029] The fan unit 1 includes an axial flow fan 3 and a direct-drive reluctance synchronous motor 4. The fan unit 1 is located inside the fan duct. The bottom of the axial flow fan 3 is directly connected to the direct-drive reluctance synchronous motor 4. This invention reduces energy consumption by using a direct connection instead of a speed reducer. Replacing the AC asynchronous motor with the direct-drive reluctance synchronous motor 4 can save more than 20% of electricity. The direct connection between the direct-drive reluctance synchronous motor 4 and the axial flow fan 3 not only eliminates the need for a speed reducer and coupling, thus reducing energy consumption, but also significantly reduces the economic and time costs of maintenance and repair. The cooling tower also operates with lower noise. The direct-drive reluctance synchronous motor 4 is connected to a frequency converter 6. The frequency converter 6 adjusts the speed of the direct-drive reluctance synchronous motor 4 based on the data difference between signal thermometer 1 (7) and signal thermometer 2 (8).

[0030] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A direct-drive fan motor unit specifically for cooling towers, characterized in that: It includes an axial flow fan (3) and a direct-drive reluctance synchronous motor (4) installed inside the air duct. The axial flow fan (3) is connected to the output end of the direct-drive reluctance synchronous motor (4). The body of the direct-drive reluctance synchronous motor (4) is vertically installed on the cooling tower through a base (5). The base (5) includes a support ring surface (51). The inner ring of the support ring surface (51) is provided with an annular boss (52) that fits into the bottom of the direct-drive reluctance synchronous motor (4). The outer ring of the support ring surface (51) is provided with multiple evenly distributed fixing ears (53). The bottom of the support ring surface (51) is provided with several evenly distributed support feet (54).

2. The direct-drive fan motor unit for cooling towers according to claim 1, characterized in that: The base (5) is made of steel, and the annular boss (52), fixing ear (53) and support foot (54) are all integrally formed on the support ring surface (51).

3. The direct-drive fan motor unit for cooling towers according to claim 2, characterized in that: The axial flow fan (3) and the direct drive reluctance synchronous motor (4) are connected by a conical structure.

4. The direct-drive fan motor unit for cooling towers according to claim 3, characterized in that: The axial conical structure includes a conical hole (33) and a conical shaft (41). The conical hole (33) is opened on one side of the axial flow fan (3), and the conical shaft (41) is located on one side of the direct drive magnetic reluctance synchronous motor (4). The conical shaft (41) can be inserted into the conical hole (33) and drive the axial flow fan (3) to rotate.

5. The direct-drive fan motor unit for cooling towers according to claim 4, characterized in that: The axial flow fan (3) includes a hub (31), a tapered hole (33) is opened at the center of the lower part of the hub (31), the output end of the direct drive magnetic reluctance synchronous motor (4) is a tapered shaft (41), and the hub (31) is connected with a fan blade (32) around its periphery. There are no fewer than four fan blades (32) and they are evenly distributed.

6. The direct-drive fan motor unit for cooling towers according to claim 1, characterized in that: A three-parameter monitoring instrument (2) is connected to the direct-drive reluctance synchronous motor (4).

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